Condenser for refrigerating machines



Feb. 4, 1936. D. F. NEWMAN CONDENSER FOR REFRIGERATING MACEINES FiiedDec. 1, 19:54

Fig.2.

v Inventor; Delbert F.Newman.,.

orne

Patented Feb. 4 1936 GONDENSER FOR MAC REFRIGERATING HINES Delbert F.Newman, Schenectady, N. Y., assignor to General Electric Company, acorporation of New York Application December 1,

1934, Serial No. 755,559

10 Claims. (Cl. 25736) My invention relates to air cooled condensers ofthe type arranged'to surround a casing of a-- refrigerating machine andcarried on a heat conducting support extending about the casing.

An object of my invention is to provide an aircooled condenser of thetype referred to above for refrigerating machines which provides a rela.tively large heat dissipating surface within a relatively small spaceabout the'casing and which is provided with smooth exterior surfaceswhich are easily cleaned and attractive in appearance.

A further object of my invention is to provide an air cooled condenserof the type referred to above for refrigerating machines, which is ruged in construction and economical in manufacture.

Further objects and advantages of my invention will become apparent asthe following description proceeds and the features of novelty whichcharacterize my invention will be pointed out with particularityin' theclaims annexed to and forming a part of this specification.

For a better understanding of my invention, ref erence may be'had to theaccompanying drawing in which Fig. 1 is afront elevation of a re-"frigerating machine adapted to cool a refrigerator cabinet or the like,the refrigerating machine having an air cooled condenser embodying myinvention; Fig. 2 En perspective view, partly in section, of the aircooled condenser and casing shown in Fig. 1, and Fig.3 is a fragmentarysectional view of the upper portion of the air cooled condenser shown inFig. 2.

- Referring to the drawing, in Fig. 1 I have shown an hermeticallysealed casing l containing a motor driven compressor unit, whichsupplies compressed refrigerant to an air cooled condenser I! embodyingmy invention. The compressed refrigerant is liquefied in the condenserII and flows t ough a conduit l2 to a flow-controlling 40 float v ve l3from which it passes through the liquid line H to a flooded typeevaporator IS. The evaporator I5 is supported on the lower side ofanupper removable wall it of a refrigerator cabinet. The liquidrefrigerant passing to evaporator I5 is vaporized by the absorption. ofheat from the interior of the refrigerator cabinet in which theevaporator I5 is located, the vaporized re-' frigerant being collectedin headers ll of the evaporator l5. The vaporized refrigerant collectedin the headers fl above the level of the liquid refrigerant therein isdrawn off through the suction line 8 by the motor driven compressor'inthe casing l0.

The air cooled condenser II, which embodies 55 ,my invention, includesan imperforate cylindrical member made of sheets of metal l9 and 20, asbest shown in Fig. 2. Complementary sinuous indentatidns l9 and 20 areformed in the sheets I!) and 20, respectively, the sheets l9 and 20 arethen secured together in face engagement by 5 welding or otherwisesecuring them tog ther along their edges and between the indent tionsformed therein. The welding may be in the form of a line weld or aseries of closely spaced spot welds. The sheets are then bent into theform of m a cylinder and their ends secured together by weldingorotherwise, along a seam 22. When so assembled with the indentations in.one sheet registering with those in the other, the sheets l9 and 20define a sinuous refrigerant passage 2| between their opposed faceswhich extends substantially about the cylindrical member.

A zig-zag annulus of fins 23,-made of good heat conducting material,extends about the hermetically sealed casing H), a series of slots 25being formed in the outer edge of the annulus 23. A heatdissipatingrefrigerant conduit 24 is provided in the form of a helix whichsurrounds the casing ID and is supported in the slots 25 in the annulus23. 25

In' assembling the condenser construction described the refrigerantconduit 24 is wound about the annulus 23 in the slots 25 formed therein.The inside diameter of the imperforate cylindrical member made up ofsheets I9 and 20 is made 30 somewhat smaller than the outside diameterof the annulus 23 so that the cylindrical member may be be force-fittedon the annulus. .The inside diameter of the annulus 23 is preferablyarranged to be slightly smaller than the outside diameter 35 of thecasing l0. when the cylindrical memberis in position on the annulus. Theassembled cylindrical member and annulus may then be for cefitted on thecasing l0. Good 'heat conducting contact is thus provided betweenthecasing l0 and 40 the annulus 23 and between the annulus 23 and thecylindrical member made up of sheets l9 and 20.

Gaseous'refrigerant compressed by the motor driven compressor unitcontained in the casing Ill enters the refrigerant conduit 24 at inletconnection 26, passes through the heat dissipating' refrigerant conduit24 and enters the refrigerant passage 2| at 21. After circulatingthrough the refrigerant passage 2| the condensed refrigerant leaves theair cooled condenser ,ll through the liquid line l2. In the operation ofthe refrigerating machine described, heat is dissipated from the casingHi, the annulus 23, and the cylindrical member made up of sheets l9 andby air circulating upwardly between the casing and thecylindricalmember, the air being cir-' culated by natural draft.

In this construction a large amount of heat may be readily dissipatedfrom the casing I0 not only to the surrounding air, but also through theannulus 23 to the air circulating over the surface thereof. Also a largeamount of heat may be dissipated from the refrigerant as it passes inseries through the conduit 24 and the passage 2|, the heat passingthrough the walls of the conduit and passage to the circulating air,' Itwill be noted that the annulus 23 is also in good heat conductingcontact with the refrigerant conduit 24 and refrigerant passage 2|, andas a result heat is transferred from the walls of the conduit andpassage to the annulus 23 and then to the surrounding air. The slots 25in the annulus 23, in which the refrigerant conduit 24 is supported, arm'ade deep enough so that the conduit 24 is supported in ap'ortion ofthe annulus 23 which v is at a sufliciently low temperature to cool theconduit. As best shown in Fig. 3 the refrigerant the appended claims tocover all modifications within the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is: 40

air cooled condenser including a cylindrical member surrounding saidcasing in spaced relation thereto, a-support of heat conducting materialconnecting said casing and said cylindrical mem-' ber, andaheat-dissipating refrigerant-conduit carried by said supportintermediate said casing and said cylindrical member and extending aboutsaid casing.

2. A refrigerating machine having a'casing', an air cooled condenserincluding a zig-zag annulus of heat conducting material surrounding saidcasing, an imperforate cylindrical member secured to the periphery ofsaid annulus, and a heat-dissipating refrigerant conduit carried ,bysaid annulus intermediate said casing and said cylindrical member andextending about said;

casing.

- 3. A refrigerating machine having a casing, an air cooled condenserincluding an imperforate cylindrical member surrounding said casing inspaced relation thereto, said cylindrical member including a pluralityof sheets having juxtaposed faces and defining a sinuous refrigerantpassage .betyveentheir juxtaposed faces, a support of heat conductingmaterial connecting said casing and ;,said' cylindrical member, and aheat-dissipating refrigerant conduit connected to said refrigerantpassage, said conduit being carried by said support'intermediate saidcasing and said cylindrical member and extending about said casing.

4. A refrigerating machine having a casing, an air 0 led condenserincluding a zig-zag annulus -of' heat conducting material surroundingsaid casing, an imperforate cylindrical member secured -to the peripheryof said annulus, said stru'ction shown and described, and I intend in.

1. A refrigerating machine having a casing, an

cylindrical member including a plurality of sheets having juxtaposedfaces and defining a sinuous refrigerant passage between theirjuxtaposed faces, and a heat-dissipating refrigerant conduit connectedto said refrigerant passage, said con- 5 duit being carried by saidannulus intermediate said casing and said cylindrical member andextending about said casing.

5. A refrigerating machine having a casing, an air cooled condenserincluding a zig-zag annulus of heat conducting material surrounding saidcasing and provided with a series of slots in the outwardly projectingportions of said annulus, an, imperforate cylindrical member secured tothe periphery of said annulus, said cylindrical member including aplurality of sheets having juxtaposed faces and defining a sinuousrefrigerant passage between their juxtaposed faces, said refrigerantpassage being positioned adjacent the sections of said annulusintermediate said slots, and a heat-dissipating refrigerant conduitconnected to said refrigerant passage and supported in said slots.

6. A refrigerating machine having a casing, an air cooled condenserincluding an imperforate cylindrical member surrounding said casing inspaced relation thereto, said cylindrical member including contactingmetallic sheets joined together in face engagement, at least one of saidsheets having a sinuous indentation formed therein cooperating with theother of said sheets to form a sinuous refrigerant passage extendingabout said cylindrical member,-supporting means of heat conductingmaterial connecting said casing and said cylindrical member, and aheat-dissipating refrigerant conduit connected to said together in faceengagement, at least one of said I air cooled condenser including azig-zag annulus sheets having a.- sinuous indentation formed thereincooperating with the other of said sheets to form a sinuous refrigerantpassage extending about said cylindrical member and lying adjacent thesections of said annulus intermediate said slots, and an extendedheat-dissipating refrigerant conduit connected to said refrigerant pas-56 sage and supported in said slots.

8. A refrigerating machine having a casing, an

air cooled condenser including an imperforate cylindrical membersurrounding said casing in spaced relation thereto, supporting means ofheat conducting material connecting said casing and said cylindricalmember, and a heat-dissipating refrigerant conduit extending about saidcasing in heat-transfer relationship with said supporting meansintermediate said casing and said cylindrical member and positioned on aportion of said supporting means which is at a sufliciently lowtemperature to cool said conduit. Y i 9. A refrigerating machine havinga casing, an

70 of heat conducting material surrounding said c sing, an imperforatecylindrical member sec ed to "the periphery of said annulus; saidcylindrical member including a plurality of sheets having juxtaposedfaces and defining a sinuous refrig- 75 erant passage between theirjuxtaposedfaces, and a heat dissipating refrigerant conduit connected tosaid refrigerant passage and supported by said annulus intermediate saidcasing and said cylindrical member andextending about said casing on aportion of said annulus at a sufliciently low temperature to cool saidconduit.

10. A refrigerating machine having a casing,

an air cooled condenser including a zig-zag annulus, an imperforatecylindrical member se- 1 cured to the periphery of said annulus, saidcylindrical member including contacting metallic sheets joined togetherin face engagement; at least one of said sheets having a sinuous indentation found thereincooperating with the other of said sheets to form asinuous refrigerant passage extending about said cylindrical member saidrefrigerant passage being'positioned adjacent the sections of saidannulus intermediate said slots', and a heatdissipating refrigerantconduit connected to said refrigerant passage and supported in saidslots at a portion of said annulus at a sufficiently lowtemperature tocool said conduit.

DELBERT F. NEWMAN.

